CODEWITHSUNDEEP
winformstabcontrolwindows-forms-designer
JNygren
JNygren

Reputation: 189

How can I switch tabs in a WinForms TabControl in designer?

I have inherited code that includes a Windows Form that contains a TabControl with 5 tabs. I can't switch tabs in the designer. When I open the form in design view, the first tab is selected, and the contents of the first TabPage is displayed. When I try to switch tabs, the correct tabs at the top are selected, but only the first TabPage is displayed. I can add tabs to the control, but they don't display with an empty TabPage to work with. How can I switch tabs in the designer view so I can modify the content of the second or third TabPage?

Upvotes: 0

Views: 2062

Answers (2)

Yaroslav Gorohov
Yaroslav Gorohov

Reputation: 11

crooked-handed programmers did not foresee this :) add prop in editor ActiveTab

 public class ExTabControl : TabControl
    {
        private const int TCM_ADJUSTRECT = 0x1328;
        private bool showBtn = false;
        private Message mes;


        public int? ActiveTab
        {
            get
            {
                if (this.TabPages.Count == 0 || this.SelectedTab == null)
                    return null;

                return this.TabPages.IndexOf(this.SelectedTab);
            }
            set
            {
                if (this.TabPages.Count > 0 )
                {
                    var _value = Math.Max(value ?? 0, 0);
                    var v = Math.Min(_value, this.TabPages.Count - 1);
                    this.SelectedTab = this.TabPages[v];
                }                
            }
        }


        [DefaultValue(false)]
        public bool ShowBtn
        {
            get => showBtn;
            set
            {
                showBtn = value;
                WndProc(ref mes);
            }

        }
        protected override void WndProc(ref Message m)
        {
            mes = m;
            if (m.Msg == TCM_ADJUSTRECT && !showBtn)
            {
                m.Result = (IntPtr)1;
                return;
            }
            base.WndProc(ref m);
        }
    }

Upvotes: 1

Sunil Gautam
Sunil Gautam

Reputation: 21

Click on TabControl in WindowsForm. Go to Properties>TabPages. On the left side, you will see tabs listed, there will be 2 arrows next to them, using the arrow, take the tab you want to view/edit to the top and click Ok. This should solve your issue for now.

Upvotes: 0

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